A device for producing high-energy neutrons by using a charged particle accelerator. Neutron generators are used in various pulsed neutron devices and some neutron porosity measurements. In a typical device, deuterium (²D) and tritium (³T) ions are accelerated towards a target also containing the same isotopes. When ²D and ³T collide, they react to produce a neutron with an energy of about 14. 1 MeV. The first neutron generators were built in the late 1950s and soon led to the first pulsed neutron capture log.